The essential knowledge and skills of learning ‘Typed Command Line Parser’ framework in the Java class library
Learn the necessary knowledge and skills of the "Typed Command Line Parser" framework in the Java library
Introduction:
In Java development, command line parsing is a very common task that allows us to read parameters from the command line and pass it to the program that we to us.In this regard, the "Typed Command Line Parser" framework in the Java class library is a powerful and easy -to -use tool that can help developers easily analyze and handle command line parameters.This article will introduce the necessary knowledge and skills of the "Typed Command Line Parser" framework, and provide a complete programming code and related configuration description.
1. What is the "Typed Command Line Parser" framework?
"Typed Command Line Parser" is a Java class library that provides a simple and type secure way to analyze the command line parameters.It can automatically convert the command line parameters into a specified type and provide flexible option configuration and error processing mechanism.Using this framework can quickly implement the command line parameter analysis function, reducing the tedious manual analysis work.
Second, the step of using the "Typed Command Line Parser" framework
1. Introduce dependencies
First of all, it is necessary to ensure that the construction file of the project contains the dependency item of the "Typed Command Line Parser" framework.You can introduce dependencies by adding the following coordinates to the constructing files (such as maven's pom.xml):
<dependency>
<groupId>com.github.sbridges</groupId>
<artifactId>typed-command-line-parser</artifactId>
<version>1.0</version>
</dependency>
2. Create command line parameters object
Next, you need to create a Java class to represent the command line parameter object.This class should contain a field corresponding to the command line parameters, and uses annotations to specify its name, default value, description information, etc.For example:
import sbridges.argparser.Arg;
import sbridges.argparser.DefaultValue;
import sbridges.argparser.Description;
public class CommandLineArguments {
@Arg(shortName = "-u", longName = "--username")
@Description("The username")
private String username;
@Arg(shortName = "-p", longName = "--password")
@DefaultValue("guest")
@Description("The password")
private String password;
// Getters and setters
}
In the above example, the `Commandlinearguments' defines two command line parameters:` username` and `Password`, and use the annotations of` `@arg`,@defaultValue,`@description`Essence
3. Analyze the command line parameters
In the code, it initializes it by creating the class of the `Arguumentparser" and the class of the command line parameter object.Then, you can use the `argumentparser.parseargs (string [] args) method to analyze the command line parameters.For example:
import sbridges.argparser.ArgumentParser;
public class Main {
public static void main(String[] args) {
ArgumentParser parser = new ArgumentParser(CommandLineArguments.class);
CommandLineArguments commandLineArgs = parser.parseArgs(args);
// Use the command line parameters for follow -up operation
String username = commandLineArgs.getUsername();
String password = commandLineArgs.getPassword();
// Other business logic
}
}
In the above examples, we created an object of `ArgumentParser, and passed into the` Commandlinearguments` class.Then, call the `PARSEARGS` method to parse the command line parameters and obtain the analysis of the command line parameter object.Next, you can use the object to obtain the specific value of the command line parameters to perform subsequent business logic.
3. Detailed configuration and additional functions
In the "Typed Command Line Parser" framework, the command line parameters can be configured in detail through annotations.The main annotations include:
-`@Arg`: short names for specifying command line parameters (Shortname) and longname.
-`@DefaultValue`: The default values for setting the parameters.
-`@Description `: Used to add description information of parameters.
In addition, this framework also provides other functions, including but not limited to:
-The analysis of complex objects: Support the complex object defined by the user as the command line parameter and analyze it.
-Error treatment: You can handle errors during the line parameter parsing of the command line parameter by capturing the `Argumentexception`.
-On help information generation: The help information of the command line parameters can be automatically generated, and the user's use process can be simplified.
Fourth, summary
"Typed Command Line Parser" is a powerful and easy -to -use Java class library that can help developers easily analyze and handle command line parameters.In this article, we introduce the necessary knowledge and skills to use the framework, and provide a complete programming code example and related configuration description.By learning and mastering these contents, I believe you can develop command line parameters more efficiently.
